The Aztecs buried offerings that came from the Atlantic and Pacific coasts. Bringing objects from these remote areas demonstrated the Aztec’s reach and power. The objects also functioned as a microcosm of the universe. Offering 7, recovered from the Huitzilopochtli side of the twin pyramid, dates to a construction period associated with emperor Moctezuma I (r. 1440–69) or Axayactl (r. 1469–81). Its contents—largely aquatic material such as seashells, freshwater fish, coral, and reptiles—evoke the layers of the cosmos, from the watery underworld to the surface of the earth. The offering also includes effigies of Xiuhtecuhtli and Tlaloc, the gods of fire and rain, who together preside over the gift and establish cosmic order.